Essential Design The Rolex Oyster Perpetual 36 is a distilled expression of Rolexs watchmaking heritage. With its clean lines, precision engineering and enduring style, it remains a timeless choice for everyday wear. Balanced Aesthetics This 2015 reference features a 36mm Oystersteel case with a domed bezel and silver dial. Powered by the calibre 3130 automatic movement, it offers approximately 48 hours of power reserve. The Oyster bracelet is secured with an Oysterclasp, delivering a streamlined and comfortable fit.